Not trying to argue over such a moot point because in most cases you are correct, even in your Hitchhiker's references. I know it's not worth arguing over such meaningless technobabble anyway, but what the heck.
There is a tendency to refer to stars with planets orbiting them as 'suns' on occasion. However, truly there is only one sun, and whether capitalized or in lower case, it is still only the star around which earth orbits. Similarly, the same has been done in reference to 'solar systems'.
http://www.thefreedictionary.com/solar+system
Again, I want to emphasize that in it's truest meaning you are correct: the Solar System is specifically the star system with Sol, the sun, at its center. However in numerous laymen's lexicon, a solar system is any star system, and 'solar' is the adjectival description of any star with orbiting planets.
So what's my point? Well, it's that there are clearly little planets orbiting that fusion reactor inside all star destroyers!
Now can anyone tell me where I left my tachyon pulse generating hydrospanner? I seem to remember leaving it with my quantum fission inductor, but now it's not there.